WordPress 4.2

[autoinstalls/wordpress.git] / wp-includes / post-thumbnail-template.php

diff --git a/wp-includes/post-thumbnail-template.php b/wp-includes/post-thumbnail-template.php
index 65a517266a119cbb6298b822efd1af4b8ab95e40..f1d70364576e9873cec59003f3eeeead8f31cacb 100644 (file)
--- a/wp-includes/post-thumbnail-template.php
+++ b/wp-includes/post-thumbnail-template.php
@@ -2,8 +2,8 @@
 /**
  * WordPress Post Thumbnail Template Functions.
  *
- * Support for post thumbnails
- * Themes function.php must call add_theme_support( 'post-thumbnails' ) to use these.
+ * Support for post thumbnails.
+ * Theme's functions.php must call add_theme_support( 'post-thumbnails' ) to use these.
  *
  * @package WordPress
  * @subpackage Template
@@ -35,12 +35,22 @@ function get_post_thumbnail_id( $post_id = null ) {
 }
 
 /**
- * Display Post Thumbnail.
+ * Display the post thumbnail.
+ *
+ * When a theme adds 'post-thumbnail' support, a special 'post-thumbnail' image size
+ * is registered, which differs from the 'thumbnail' image size managed via the
+ * Settings > Media screen.
+ *
+ * When using the_post_thumbnail() or related functions, the 'post-thumbnail' image
+ * size is used by default, though a different size can be specified instead as needed.
  *
  * @since 2.9.0
  *
- * @param int $size Optional. Image size.  Defaults to 'post-thumbnail', which theme sets using set_post_thumbnail_size( $width, $height, $crop_flag );.
- * @param string|array $attr Optional. Query string or array of attributes.
+ * @see get_the_post_thumbnail()
+ *
+ * @param string|array $size Optional. Registered image size to use, or flat array of height
+ *                           and width values. Default 'post-thumbnail'.
+ * @param string|array $attr Optional. Query string or array of attributes. Default empty.
  */
 function the_post_thumbnail( $size = 'post-thumbnail', $attr = '' ) {
        echo get_the_post_thumbnail( null, $size, $attr );
@@ -49,10 +59,13 @@ function the_post_thumbnail( $size = 'post-thumbnail', $attr = '' ) {
 /**
  * Update cache for thumbnails in the current loop
  *
- * @since 3.2
+ * @since 3.2.0
+ *
+ * @param object $wp_query Optional. A WP_Query instance. Defaults to the $wp_query global.
  */
-function update_post_thumbnail_cache() {
-       global $wp_query;
+function update_post_thumbnail_cache( $wp_query = null ) {
+       if ( ! $wp_query )
+               $wp_query = $GLOBALS['wp_query'];
 
        if ( $wp_query->thumbnails_cached )
                return;
@@ -64,41 +77,84 @@ function update_post_thumbnail_cache() {
        }
 
        if ( ! empty ( $thumb_ids ) ) {
-               get_posts( array(
-                               'update_post_term_cache' => false,
-                               'include' => $thumb_ids,
-                               'post_type' => 'attachment',
-                               'post_status' => 'inherit',
-                               'nopaging' => true
-               ) );
+               _prime_post_caches( $thumb_ids, false, true );
        }
 
        $wp_query->thumbnails_cached = true;
 }
 
 /**
- * Retrieve Post Thumbnail.
+ * Retrieve the post thumbnail.
+ *
+ * When a theme adds 'post-thumbnail' support, a special 'post-thumbnail' image size
+ * is registered, which differs from the 'thumbnail' image size managed via the
+ * Settings > Media screen.
+ *
+ * When using the_post_thumbnail() or related functions, the 'post-thumbnail' image
+ * size is used by default, though a different size can be specified instead as needed.
  *
  * @since 2.9.0
  *
- * @param int $post_id Optional. Post ID.
- * @param string $size Optional. Image size.  Defaults to 'thumbnail'.
- * @param string|array $attr Optional. Query string or array of attributes.
+ * @param int $post_id       Post ID. Default is the ID of the `$post` global.
+ * @param string|array $size Optional. Registered image size to use, or flat array of height
+ *                           and width values. Default 'post-thumbnail'.
+ * @param string|array $attr Optional. Query string or array of attributes. Default empty.
  */
 function get_the_post_thumbnail( $post_id = null, $size = 'post-thumbnail', $attr = '' ) {
        $post_id = ( null === $post_id ) ? get_the_ID() : $post_id;
        $post_thumbnail_id = get_post_thumbnail_id( $post_id );
+
+       /**
+        * Filter the post thumbnail size.
+        *
+        * @since 2.9.0
+        *
+        * @param string $size The post thumbnail size.
+        */
        $size = apply_filters( 'post_thumbnail_size', $size );
+
        if ( $post_thumbnail_id ) {
-               do_action( 'begin_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size ); // for "Just In Time" filtering of all of wp_get_attachment_image()'s filters
+
+               /**
+                * Fires before fetching the post thumbnail HTML.
+                *
+                * Provides "just in time" filtering of all filters in wp_get_attachment_image().
+                *
+                * @since 2.9.0
+                *
+                * @param string $post_id           The post ID.
+                * @param string $post_thumbnail_id The post thumbnail ID.
+                * @param string $size              The post thumbnail size.
+                */
+               do_action( 'begin_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size );
                if ( in_the_loop() )
                        update_post_thumbnail_cache();
                $html = wp_get_attachment_image( $post_thumbnail_id, $size, false, $attr );
+
+               /**
+                * Fires after fetching the post thumbnail HTML.
+                *
+                * @since 2.9.0
+                *
+                * @param string $post_id           The post ID.
+                * @param string $post_thumbnail_id The post thumbnail ID.
+                * @param string $size              The post thumbnail size.
+                */
                do_action( 'end_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size );
+
        } else {
                $html = '';
        }
+       /**
+        * Filter the post thumbnail HTML.
+        *
+        * @since 2.9.0
+        *
+        * @param string $html              The post thumbnail HTML.
+        * @param string $post_id           The post ID.
+        * @param string $post_thumbnail_id The post thumbnail ID.
+        * @param string $size              The post thumbnail size.
+        * @param string $attr              Query string of attributes.
+        */
        return apply_filters( 'post_thumbnail_html', $html, $post_id, $post_thumbnail_id, $size, $attr );
 }
-
-?>